Planoguaph co



T. H. MARTEN.

DAVIT FOR SHIPS LIFE BOATS.

APPLICATION FILED MAR- i5. ms.

Patented Oct. 21,1919.

3 SHEETS-SHEET I.

rm: coLumuA PLANQGRM'" Cu., WASHINGTON. n. c.

T. H. MARTEN.

DAVIT FOR SHIPS LIFE BOATS.

APPLICATION FILED MAR-15.1918.

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DAVIT FOR SHIPS LIFE BOATS.

APPLICATION FILED MAR- l5. I9l8.

3 SHEETS$HEET 3.

Inventor.

Patented Oct. 21, 1919.

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unrrn s THOMA HENRY MA EN, or ronom'o, N'TARIO, on mnn.

i To all concern) Be it knownthat 1,,THOMAS HENRY MA TEN, a subject of the King of Great Britvain, and residentv-ofithecity of Toronto,

county of York l frovince of Ontario, in

. the Dominionof Canada, have invented cer- ;its for Ships? Life-Boats,- as described in o part of; the same.

rain newand seful Improve s in the following specification and illustrated in the 'a'ccompanying drawings that form The-principal object 9f thisinvention are,. to-provide an improvedmeans foropa :erating life boat davits particularly of the type in whichjthe boom swings n avertical plane uponai fixed pivot and which wlll not be detrimentally affected by bendmg stresses causedby deflections of the'boom or of other partsofthedavit structure and in which the actuating members are effectlvely protected from injury.

A furtherand important object is to. devise a structure in which the member operatively connecting. the boom with the actuating member imparts stabilityto said actuating member and maintains the latter free of bending stresses and further limits the actuating member'lfailing.

The principal feature of the invention consists in the novel construction and sin i rangement of parts, whereby the davit boom is connected intermediate of itslends' to a rigid support by a telescopic member, the

outer portion" of which'i's actuated by a rotatable screw spindle mounted on the rigld 7 support and flexibly connected with said outer telescopic member.

showing the positionof the parts when theboomisintheextremeinbo'ardposition.

I Fig. 2is aside elevational yiewishowing the parts in their extended position when the boom isswung outboard." I

Fig, 3 is'an enlarged sectional detail view of themeel s forfoperating the davit bjoom.

n Fig. lj'is a detail plan view'of thefs'crew spindle showingthe pivotal support forjthe pera ingsp n l a,

fThe type of the davit herein shown is .9 extending transversely of the portions DAVIT FOR SHIPS LIFE-BOATS.

Patented Oct. 21, 1919.

iip uaeoafil emm 15,-1918 Serial No.'j222,-710.

that in which the boom 1 is ;pivotally sup ported at its footto swing in a vertical plane, the pivot pin 2 being mounted in the base 3, secured to the deck of the ship.

a A frame 4 connected with the base 3 and secured to the deckiextends in an upward inboard direction and is; here shown formed with a pair; of horizontally arranged lugs 5-.

Apin 6 is pivotally mounted in the lugs 5 andjis formedwitha head 7 bearing upon the upperlug and said head is bifurcated at its upper end.

A rod 8 is pivotallymounted onthe pin thr g e pp bifurcated end of the he d and forms one of the telescopic boomsupport. 5 l i i member slidably encircles the rod8, its inboard end having asubstantial length of bearing upon the rod and the remaining portion ll thereof isrof greater inside diameter-thanthe diameter of the rod 8.

12 is a collar securedto the outer end of the rod '8 and slidably engaging the enlarged inner portion 11 ofthe sleeve 10 and said collar abuts the bearing.- end of: the

maximum position. l n t r The outer end of the sleeve 10 is formed with a shoulder 13 and encircles said sleeve adjacent to andeablitting said shoulder is a gsleeve when the; member is e ztended to its the movementof the boom in the event of shackle memberfll wh m is provided with a awend 15., the outer end of which is secured to the pin 16 extending through the davit' boom. The shackle member ll is secured n place .uponfthfe sleeve 10 by able set s crews '17.

1 C0113? 1' l fl rcles the; inboard end of In the drawings, Figure 1 isa side ele vafiionel i O improved form of dawn; I

the sleeve 10 andis rigidly secured thereto n any su table manner, set screws 20 bef ng shown extending through said collar jin ojthesl e.

; and preferably .jgiarallel' to the sleeve.

A screwsp'indle 23 is 'journaled atone end in a housing 24 and extends through the bifurcated portion of the pivotal head and throughthe openings 22and is threading ed through a nut which is arranged in the space 26 and loosely engages the lugs 21 of the collar 19. I V

Thohousing-is pivotally supported upon the'pins 27 rigidly mounted in the head 7 by the ring bolts 28. This pivotal support .c for the spindle" allows it to swing so that it maintains its relation substantially: parallel with the telescoping boom connection.

as said boom connection swings upon its piv otal support on the head 7.

A tube 29 is suspended from the sleeve 10 by the members 30 and incloses the spindle and forms a guide for the spindle which is provided with a collar'31 sliding therein. In the operation of this device'the spindle 23 is rotated by means of the operating crank 32 secured at the inner end and the rotation of the spindle in one direction causes the nut 25 to travel outwardly pushthe sleeve 10 outwardly ;upon the rod 8 until the collar on the endof therod engages the shoulder 33 at theinboard end of the sleeve.

The independent pivotal arrangement of the screw spindle and the manner of connection with the telescopic members obvlates any binding action upon the spindlethrough normal distortions of the tGlQSCOPlC members; Further, the operating members are 7 supported at'the nner end upon a vertical pivot and a universal pivotal support for the operatingvmembers is provided.

The, structure of thetelescopic members is such that in the event 'of failure of the "screw spindle through, any cause the outwardswing of theboom islimited by'the engagement of the collar 12 with the shoul der 33 in the sleeve 10. f' 3 r 'A davit such as described will operate veryrfreely and the parts are ofvery simple construction.f V

What Iclaim as invention is 1. Ina davit'for ships life boats,the combination with'the boom and a rigid support,

is or a telescopic member having one'endconnected to the boom intermtdiate of; its ends and the otherf-end, connected to said rigid .7 'support,'and a screw spindle mountedfon said rigid support and operatively "connected' witlr the operating portion of said J telescopic'membenin a davit'forships",lifeboatathe ce binati'on with the: boom and a rigid support,

7 of a telescopic member having'one end-con-Q .nectefd to the boomintermediateof its ends and the other end'connected to said rigid support,

and; a s'crewflspindle pivotally mounted on said rigidsupport and flexibly connected with-the operating 'portionof said telescopic member.

,3." In aydavit for ships 'lifeboats the'comqbination with the boom and arigid support,

of atelescopic member having one end connected to the boomintermediate of its ends and the other end pivotally connected to said rigid, support, and a screw spindle pivotally supported from said rigid support and flexibly connected with the'operating portionof said telescopic member; 7

4. In a davit forships life boats," the combination with the boom and a rigid frame structure, of a tubular member pivotally conapiVOt head secured to said frame, a rod pivotallyconnectedto said pivot head and telescoping into said tubular member, and

a screw spindle pivotally; mounted on. said pivot head and flexiblyconnected with said tubular member.

a 5. In a davitforjships life boats, thecombination with a'boom anda-rigid frame, of a tubular member pivotally connected to the boom intermediate of "its -ends, arod telescopicallyarranged insaid-tube and connected to Saidrig id fra ne, a-collar member secured to the inner endof said' tubul'ar nectedito said boom-intermediate of itsends,

member and having a pair' of-lugs proj ectingj,

from onefside thereoflsaid lugs' having openings therethrough,fla journal; 'pivotally mounted :on said rlgid frame, a screw spindle 'supportedfin saidjournal and extending through the openings in the lugs .of' the collar memben carried by said tubular member, and a nut threaded on said spindle and loosely arrangedv between said lugs.

6; In a davit for ships life boats, the comif bination with the boom and a rigid frame, a vertically arranged pivot head supportedin said frame, a journal pivotally supported upon transversely arranged pivots i mounted on said pivothead, a screw spindle supsecured to said pivothead above said spindle, a sleeve telescopically mounted upon said ported in" said journal, afrodbpivotally rod and pivotally connected at itsouter end to the boom, and a nut threaded 'upon" said spindle and engaging said sleeve.

7. In a davit for ships lifeboats, the V combination with the boom anda rigid support, of a pair oftelescopically' engaging members one ofwhich" is connected to the "i boom and-the other is connected to said support, said members havingpositive stops to l1m1t ethelr'outward movement, "and a screw gspindle mounted on .the rigid support. and fperatively 'co11nected;;with the operating theouter end'of said spindle.

9. In a davit for ships life boats, the cornnected with the operating portion of said bination with the boom and a rigid support, telescoping member, and a tubular guide of a telescopic member having one end consupported from the telescopic member and 10 nected to the boom intermediate of its ends arranged parallel thereto and inclosing aid 5 and the other end connected to said rigid screw spindle.

support, a screw spindle pivotally mounted on said rigid support and operatively con- THOMAS HENRY MARTEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

